Indices; Brfm; Bbfm - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
Antenna VSWR, the LNA status monitoring alarm signals and forward power
detection voltage signals, which are outputted to the BRCM by the RLDU through
a DB15 interface in front of the module and transmitted to the BIFM for processing.
The +24V DC power is necessary for the RLDU. It is provided directly by the secondary
power supply module in the BTS through a MOLEX power connector in front of the
module.

3.8.4 Indices

Supported frequency band: 450MHz band, 800MHz band, and 1900MHz band
Power supply: +24VDC
Power consumption: <50W
Module dimensions: 450mm%180mm%50mm (Length%Width%Depth)

3.9 BRFM

The BTS RF Fan Module (BRFM) mainly consists of the BBFM, the BBFL and fans.
The following is the introduction to the BBFM and the BBFL.

3.9.1 BBFM

I. Overview
The BTS BTRM FAN Monitor (BBFM) collects and analyzes the temperature
information of BHPA module and adjusts the fan speed in realtime to lower the system
noise, so as to prolong equipment service life and improve the external performance of
the overall system on the premise that the system works in a safe thermal status.
The Pulse Wide Modulation (PWM) control signal regarding the fan speed can be
generated by the MCU of the local board or configured by the control unit of the BTRM
module. At the same time, the BBFM reports to the BCKM the gain decrease,
over-temperature, over-excited alarm and fan failure alarm of the BHPA to ensure the
reliability of the BHPA module. Specifically, it functions to:
Control fan speed, monitor and report fan alarm.
Monitor and report the BHPA alarm.
Drive fan monitor indicator module.
Collect temperature information of the BHPA module.
Communicate with the BTRM module.
II. Structure and principle
The position of the BBFM in the BHPA module is as shown in Figure 3-9.
Chapter 3 Radio Frequency Subsystem
3-18
System Principle